<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>菜鸟教程(runoob.com)</title><!--边框-单独设置各边-->
<style>
p
{
	border-top-style:dotted;
	border-right-style:solid;
	border-bottom-style:dotted;
	border-left-style:solid;
}
</style>
</head>

<body>
<p>两个不同的边界样式。</p>
</body>
</html>